Background radiation we recieve comes from:
- Radioactivity of naturally occuring unstable isotopes - in the air, food, buildings, rocks
- Radiation from space - cosmic rays, mostly from the sun
- Radiation due to human activity - fallout from nuclear explosions , dumped nuclear waste (this is just a tiny proportion)
The level of background radiation changes depending on where you are.
At high altitudes (e.g. in a plane) you have more…